The short version of GW501516 fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2026-06-16. Anything still debated is marked as such rather than presented as settled.
Anti-doping laboratories detect GW501516 and its metabolites using liquid chromatography-tandem mass spectrometry. Urine is the most common matrix, though blood and dried blood spots may also be used in some programs. Detection depends on factors such as dose, timing, metabolism, and the sensitivity of the assay. Published methods describe limits of detection in the low nanogram per milliliter range for related compounds. Exact detection windows are not fixed for all situations and remain an area of ongoing study.
Products sold as cardarine have been found to contain incorrect compounds, variable amounts, or no active ingredient at all. Independent testing is required to verify identity and purity. Common analytical approaches include high-performance liquid chromatography, mass spectrometry, and nuclear magnetic resonance for structural confirmation. These methods can distinguish GW501516 from related PPAR agonists and from unrelated steroids. For regulators and researchers, such verification is central to interpreting both biological results and adverse event reports.
Cardarine is a common name for GW501516, a synthetic compound studied for its effects on lipid and glucose metabolism. It functions as an agonist at peroxisome proliferator-activated receptor delta, or PPARδ, a nuclear receptor that influences gene expression. The molecule is not a steroid, nor is it a selective androgen receptor modulator. It is also known in research and sports literature as GW-501516 and endurobol. Early laboratory work examined its metabolic activity in cell cultures and animal models.
Activation of PPARδ changes transcription of genes involved in fatty acid transport, mitochondrial function, and skeletal muscle fuel preference. In rodent studies, pharmacological PPARδ activation was associated with increased endurance and altered body composition. These findings generated interest in performance enhancement, but species differences and study designs limit direct extrapolation to humans. Small human trials were conducted in the 2000s and later discontinued. The extent to which cardarine produces similar metabolic or performance effects in people remains an open question.
The compound is typically described as a laboratory compound rather than a therapeutic product. Published reports have explored its role in lipid disorders, insulin sensitivity, and exercise metabolism, yet no major drug regulator has approved it for medical use. Commercial samples sold under the cardarine name may vary in purity and identity. Analytical confirmation is therefore necessary when the material is discussed in scientific or regulatory contexts. Its classification as a prohibited substance in sport further shapes how it is studied and reported.
| Property | Value | Notes |
|---|---|---|
| Regulatory status | Prohibited in sport | Listed by WADA as a metabolic modulator. |
| Approved medical use | None in major jurisdictions | Not a registered drug. |
| Common test matrix | Urine | Most anti-doping samples use urine. |
| Typical detection method | LC-MS/MS | Detects parent compound and metabolites. |
| Reference standard storage | -20 °C, desiccated | Typical for analytical standards. |
GW501516 acts as a selective agonist at PPARδ, a nuclear receptor that regulates transcription of genes involved in lipid handling and energy metabolism. Activation of PPARδ in preclinical models increases fatty acid oxidation, mitochondrial biogenesis, and exercise endurance in rodents. These effects have made the compound a subject of metabolic research and also a target for sport anti-doping rules. In humans, however, controlled studies are limited, and whether similar endurance or metabolic changes occur at tolerated exposures remains an open question. The receptor’s broad tissue distribution also means downstream effects may vary by organ and condition.
Detection of GW501516 in biological samples generally relies on liquid chromatography coupled with tandem mass spectrometry. Urine is a common matrix in anti-doping analysis, while blood or plasma may be used in research settings. Sample preparation can involve enzymatic hydrolysis, protein precipitation, or solid-phase extraction before instrumental analysis. Because the compound undergoes metabolism, assays may target the parent molecule, one or more metabolites, or both. Detection windows are not fixed; they depend on factors such as dose, route, individual metabolism, and assay sensitivity. Reference standards are required for accurate identification and quantification.
Handling and quality assessment of cardarine reference material follow general laboratory practices for poorly characterized compounds. It typically appears as a white to off-white powder and is sparingly soluble in water but soluble in organic solvents such as dimethyl sulfoxide and ethanol. Storage recommendations usually specify a cool, dry, dark place, with long-term storage at low temperature and desiccation. Purity may be checked by high-performance liquid chromatography with ultraviolet detection, while identity is confirmed by mass spectrometry and nuclear magnetic resonance. No pharmacopeial monograph exists, so reported purity and stability depend on the supplier’s methods.
Regulatory treatment of cardarine differs by context and jurisdiction. In competitive sport, the World Anti-Doping Agency lists PPARδ agonists, including GW501516, as prohibited at all times. Outside sport, it lacks approval as a prescription medicine in major drug markets, and products sold for human consumption may be treated as unapproved drugs. Some countries also restrict importation or sale through general consumer protection and medicines laws. These classifications affect availability, testing, and legal risk without establishing therapeutic value.
Because cardarine is not an approved medicine, no pharmacopeial monograph defines its identity, purity, or storage requirements. Laboratories typically rely on in-house methods and reference standards when testing materials labeled as GW501516. Certificates of analysis may report purity and identity for a specific batch, but their scope varies and they do not guarantee safety or legal status. Independent verification can include high-performance liquid chromatography, mass spectrometry, nuclear magnetic resonance, and elemental analysis. The distinction between research chemical labeling and human use is significant because quality standards and oversight differ.
WHO suggests assessing workers' exposure in workplaces with methods similar to those used for the proposed specific occupational exposure limit (OEL) value of the MNM (conditional recommendation, low-quality evidence). Because there are no specific regulatory OEL values for MNMs in workplaces, WHO suggests assessing whether workplace exposure exceeds a proposed OEL value for the MNM. A list of proposed OEL values is provided in an annex of the guidelines. The chosen OEL should be at least as protective as a legally mandated OEL for the bulk form of the material (conditional recommendation, low-quality evidence). If specific OELs for MNMs are not available in workplaces, WHO suggests a step-wise approach for inhalation exposure with, first an assessment of the potential for exposure; second, conducting basic exposure assessment and third, conducting a comprehensive exposure assessment such as those proposed by the Organisation for Economic Cooperation and Development (OECD) or Comité Européen de Normalisation (the European Committee for Standardization, CEN) (conditional recommendation, moderate quality evidence). For dermal exposure assessment, WHO found that there was insufficient evidence to recommend one method of dermal exposure assessment over another. C. Control exposure to MNMs
The Library of Congress (LOC) is a research library in Washington, D.C., serving as the library and research service for the United States Congress and the de facto national library of the United States. It also administers copyright law through the United States Copyright Office, and it houses the Congressional Research Service. Founded in 1800, the Library of Congress is the oldest federal cultural institution in the United States. It is housed in three buildings on Capitol Hill, adjacent to the United States Capitol, along with the National Audio-Visual Conservation Center in Culpeper, Virginia, and additional storage facilities at Fort George G. Meade and Cabin Branch in Hyattsville, Maryland. The library's functions are overseen by the librarian of Congress, and its buildings are maintained by the architect of the Capitol. The library is one of the largest libraries in the world, containing approximately 173 million items and employing over 3,000 staff. Its collections are "universal, not limited by subject, format, or national boundary, and include research materials from all parts of the world and in more than 470 languages". When Congress moved to Washington in November 1800, a small congressional library was housed in the Capitol. Much of the original collection was lost during the 1814 burning of Washington by British forces during the War of 1812. Congress accepted former president Thomas Jefferson's offer to sell his entire personal collection of 6,487 books to restore the library.
Persistent synovitis Early erosive disease Extra-articular findings (including subcutaneous rheumatoid nodules) Positive serum RF findings Positive serum anti-CCP autoantibodies Positive serum 14-3-3η (YWHAH) levels above 0.5 ng/ml Carriership of HLA-DR4 "Shared Epitope" alleles Family history of RA Poor functional status Socioeconomic factors Elevated acute phase response (erythrocyte sedimentation rate [ESR], C-reactive protein [CRP]) Increased clinical severity. Distance from primary care and specialist care in rural communities
Sources: en.wikipedia.org
== Hit expansion == Following hit confirmation, several compound clusters will be chosen according to their characteristics in the previously defined tests. An Ideal compound cluster will contain members that possess:
=== Federal, state, and county representation === Cresskill is located in the 5th Congressional District and is part of New Jersey's 39th state legislative district. For the 119th United States Congress, New Jersey's 5th congressional district is represented by Josh Gottheimer (D, Wyckoff). New Jersey is represented in the United States Senate by Democrats Cory Booker (Newark, term ends 2027) and Andy Kim (Moorestown, term ends 2031). For the 2026–2027 session, the 39th legislative district of the New Jersey Legislature is represented in the State Senate by Holly Schepisi (R, River Vale) and in the General Assembly by Robert Auth (R, Old Tappan) and John V. Azzariti (R, Saddle River). Bergen County is governed by a directly elected County Executive, with legislative functions performed by a Board of County Commissioners comprised of seven members who are elected at-large to three-year terms in partisan elections on a staggered basis, with either two or three seats coming up for election each November; a Chairman and Vice Chairman are selected from among its seven members at a reorganization meeting held every January. As of 2025, the county executive is James J. Tedesco III (D, Paramus), whose four-year term of office ends December 31, 2026. Bergen County's Commissioners are Chair Mary J. Amoroso (D, Mahwah, 2025), Vice Chair Steven A. Tanelli (D, North Arlington, 2027), Chair Pro Tem Joan Voss (D, Fort Lee, 2026), Rafael Marte (D, Bergenfield, 2026), Germaine M. Ortiz (D, Emerson, 2025), Thomas J. Sullivan Jr.
Aposematism, warning off possible predators, is the most likely explanation of the black-and-white pelage of many mammals which are able to defend themselves, such as in the foul-smelling skunk and the powerful and aggressive honey badger. Coat color is sometimes sexually dimorphic, as in many primate species. Differences in female and male coat color may indicate nutrition and hormone levels, important in mate selection. Coat color may influence the ability to retain heat, depending on how much light is reflected. Mammals with a darker colored coat can absorb more heat from solar radiation, and stay warmer, and some smaller mammals, such as voles, have darker fur in the winter. The white, pigmentless fur of arctic mammals, such as the polar bear, may reflect more solar radiation directly onto the skin. The dazzling black-and-white striping of zebras appear to provide some protection from biting flies.
Sources: en.wikipedia.org
Microsoft's acquisition of Bethesda Softworks in 2021 was seen as providing several potential killer app games for the Xbox Series X/S, notably Starfield from Bethesda Game Studios, which in addition to launching as a console exclusive in 2023, became a significantly focused game in Xbox's advertising of the consoles in addition to replacing prior tentpole exclusive Halo Infinite (2021) as the key visual game featured on the packaging of Xbox Series X. Ratchet & Clank: Rift Apart was seen as a killer app for the PlayStation 5 due to being a game released at a point in the console's lifecycle where much of the first-party software from Sony was also supplemented by a simultaneous release on PlayStation 4, in addition to being highlighted for its graphical fidelity and use of the console's various hardware features such as faster loading and the functions of the DualSense controller. Mario Kart World and Donkey Kong Bananza are seen as and were positioned by Nintendo as killer apps for the launch window of Nintendo Switch 2, both for their technical improvements over previous entries in their respective series, and for gameplay innovations such as World's open "Free Roam" mode and Bananza's destructible sandbox environments that leverage the increase in hardware potency. Pokémon games are killer apps for Nintendo handhelds, often topping the best-selling charts for whatever system they appear on.
The Georgia Sustainment and Stability Operations Program (GSSOP) was a security assistance program designed to create an increased capability in the Georgian military to support Operation Iraqi Freedom stability missions. Launched in January 2005, GSSOP was also designed to help solidify the progress made during the Georgia Train and Equip Program (GTEP) of 2002–2004 and continue to assist in the implementation of western standards in the Georgian armed forces. The first phase of the program (GSSOP-I) lasted about 18 months and cost approximately $60 million. It ended in October 2006 to be succeeded by GSSOP-II, which lasted until June 2007. The training was conducted, primarily at the Krtsanisi National Training Centre near Tbilisi, by the United States Army Special Forces and United States Marine Corps Forces, Europe. The beneficiaries were the 22nd, 23rd, 31st, 32nd and 33rd Light Infantry Battalions, logistic battalions of the 1st, 2nd, and 3rd Infantry Brigades, the reconnaissance companies of the 2nd and 3rd Infantry Brigades, communication companies of the 2nd and 3rd Brigades, and an independent military police company. On August 31, 2009, the U.S. and Georgia inaugurated the Georgia Deployment Program—International Security Assistance Force (GDP—ISAF) In order to prepare the Georgian units for deployment in Afghanistan as part of the International Security Assistance Force. Originally planned as a two-year engagement, the success of past missions has extended the pairing as the Georgia Deployment Program—Resolute Support Mission (GDP—RSM) into 2020.
(2026) determine the affinities of Equus dalianensis on the basis of data from mitochondrial and two nuclear genomes, recovering the studied equid as a member of a lineage within the group of northeast Eurasian wild horse populations, and reporting evidence of contact with eastern Beringian (i.e. American) horses.
==== Activation ==== Macrophages can achieve different activation phenotypes through interactions with different subsets of T helper cells, such as TH1 and TH2. Although there is a broad spectrum of macrophage activation phenotypes, there are two major phenotypes that are commonly acknowledged. They are the classically activated macrophages, or M1 macrophages, and the alternatively activated macrophages, or M2 macrophages. M1 macrophages are proinflammatory, while M2 macrophages are mostly anti-inflammatory.
Sources: en.wikipedia.org
Legal status varies by country, but cardarine is not approved as a medicine in major jurisdictions. It is often sold as a research chemical, a category that may not be lawful for human use. Buyers should check local laws and product labels carefully.
Anti-doping laboratories use LC-MS/MS to detect GW501516 and its metabolites, usually in urine. The method can identify the parent compound at low concentrations. Detection windows vary with dose and individual factors.
No, cardarine has no approved medical uses in major jurisdictions. Early research explored metabolic conditions, but those programs were discontinued. It is not a registered treatment for any disease.
Cardarine is a common name for GW501516, a synthetic PPARδ agonist. It is not a steroid or a selective androgen receptor modulator. It was developed and studied as a research compound for metabolic pathways.